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Nothing radically different, here, but photos are much larger as you scroll through the updates of your friends, which is nice; less tapping, more scrolling. From the Facebook Mobile page:

Starting today, we're rolling out an improved design for posts in news feed on your mobile phone. Now photos are up to 3x larger, and all posts will fill your mobile screen from edge to edge. The new design will be available on iOS, Android and m.facebook.com.

Until now, browsing Facebook photos on your phone has been a pain: They show up too small in your News Feed, and enlarging them requires going to another page (Layout on the left, above). The overhauled look (on the right) makes the photos larger and easier to view when you're just casually checking our your feed. No surprise, the new layout looks a lot like Instagram's. This feature is starting to roll out today but so far we've only seen it on m.facebook.com. [Facebook via Techcrunch]